Subject to subsection (2) below, a mortgage which falls within section 129(1)(a) of this Act . . . is a regulated mortgage if—
Notwithstanding that a mortgage falls within subsection (1) above, it is not a regulated mortgage if—
Subsection (2)(a) above shall have effect, in the case of land consisting of or including a dwelling-house which on 22nd March 1973 was subject to a tenancy which became a regulated tenancy by virtue of section 14 of the Counter-Inflation Act 1973, as if for the reference to the appropriate day there were substituted a reference to 7th March 1973.
In this section "legal mortgage" includes a charge by way of legal mortgage.
Any reference in this Part of this Act to a regulated mortgage shall be construed in accordance with this section.